a template helper to create ccb class loader

ccb_helper.h

template <typename T> class Template_creator
{
public:
  static T* create(){
    T* ptr = new T();
    if(ptr != nullptr && ptr->init()){
      ptr->autorelease();
      return ptr;
    }
    CC_SAFE_DELETE(ptr);
    return nullptr;
  };
};

template<typename T>
class CCBLoaderTraits
{
public:
  typedef T NodeType;
  typedef typename cocos2d::extension::CCLayerLoader ParentLoader;
};

class CCBLoader;
template<typename NodeType, typename ParentLoader = typename CCBLoaderTraits<NodeType>::ParentLoader>
class TemplateLoader : public ParentLoader
{
public:
  static TemplateLoader<NodeType>* loader() {
    TemplateLoader<NodeType>* ptr = new TemplateLoader<NodeType>();
    if(ptr != nullptr) {
      ptr->autorelease();
      return ptr;
    }
    CC_SAFE_DELETE(ptr);
    return  nullptr;
  };
  
protected:
  virtual NodeType* createCCNode(cocos2d::CCNode * pParent, cocos2d::extension::CCBReader* pCCBReader) {
    return Template_creator<NodeType>::create();
  }
};

#define REGISTER_CCB_LOADER(name) { \
node_loader_library->registerCCNodeLoader(#name, TemplateLoader<name>::loader()); }